San Francisco is where Uber and Lyft got their starts and resistance to these services seems futile. One third of taxi cab drivers in San Francisco have ditched their registered cabs and are now working for Uber, Lyft, or Sidecar, according to Fortune.

That’s according to data from the San Francisco Cab Drivers Association (SFCDA), a group for registered taxi drivers that promotes fair working conditions. The association reports that about 2,800 of the 8,500 or so taxi drivers in San Francisco have ditched their registered cab in the last year.

Uber has come a long way since its founding four years ago, but it still faces legal complications and local resistance. Earlier this week, the heated rivalry between taxi drivers and Uber turned violent when striking drivers attacked a car booked through Uber in Paris.

Nearly every time Uber launches in a new city, a fight erupts. Cabbies typically protest this new technology by lobbying government agencies, participating in nonviolent protests, or in rare cases, by taking more extreme measures.

Uber chief executive Travis Kalanick recently said that he often forgoes sleep when “two or three flareups happen in the same week,” and he has to fight regulators who “propose laws that would put us out of business.”

Challenges aside, Uber is experiencing explosive growth. The company is doubling its revenue every four months, and it now operates in 35 cities. Customers are loyal to the service, as it’s an alternative to standing on a street corner flailing an arm for a taxi.

According to Fortune, the San Francisco Municipal Transportation Agency is finally taking action to work with these new transportation apps. To meet the demands from a growing population, the agency plans to increase the number of medallions (permits to operate a cab) to 2,100, up from 1,500 in 2012.

These new drivers may discover that new technology isn’t the enemy. Fortune reports that a new app called Flywheel is helping cabbies find people in the city who need a ride in real time, which increases their productivity.